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Details

Updated libvirt packages that fix two security issues and one bug are nowavailable for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

The libvirt library is a C API for managing and interacting with thevirtualization capabilities of Linux and other operating systems.In addition, libvirt provides tools for remote management ofvirtualized systems.

A use-after-free flaw was found in the way several libvirt block APIshandled domain jobs. A remote attacker able to establish a read-onlyconnection to libvirtd could use this flaw to crash libvirtd or,potentially, execute arbitrary code with the privileges of the libvirtdprocess (usually root). (CVE-2013-6458)

A race condition was found in the way libvirtd handled keepaliveinitialization requests when the connection was closed prior toestablishing connection credentials. An attacker able to establish aread-only connection to libvirtd could use this flaw to crash libvirtd,resulting in a denial of service. (CVE-2014-1447)

This update also fixes the following bug:

* A race condition was possible between a thread starting a virtual machinewith a guest agent configured (regular start-up or while migrating) and athread that was killing the VM process (or the process crashing). The racecould cause the monitor object to be freed by the thread that killed the VMprocess, which was later accessed by the thread that was attempting tostart the VM, resulting in a crash. This issue was fixed by checking thestate of the VM after the attempted connection to the guest agent; if theVM in the meantime exited, no other operations are attempted. (BZ#1055578)

All libvirt users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. After installing theupdated packages, libvirtd will be restarted automatically.

Solution

Before applying this update, make sure all previously released erratarelevant to your system have been applied.